Improvement in dental impression-cups



WITNESSES.

a; s. roulua; Dental Impression-Cups. I Patentedhn 20.1874;

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AM P/km-umammm w. m. mmm's mmsi UNITED STATES PATENT. OFFICE.

GEORGE SHINDLER FOUKE, OF WESTMINSTER, MARYLAND.

IMPROVEMENT IN DENTAL lMPRESSlON-CUPS.

Specification forming part of Letters Patent No. 146,587, dated January20, 1874; application filed December 6, 1873. i

sponding parts.

My invention has for its object to furnish an improved cup or tray fortaking impressions for dental plates, which shall be so constructed asto allow direct manipulative pressure to be applied to the soft parts ofthe roof of the mouth after the ordinary pressure has been applied, sothat the dental plates, when cast or otherwise made, may press upon thesoft parts of the arch of the mouth rather than upon the hard parts, asthey must do when the impression is taken with the ordinaryimpressiontray, thus distributing the pressure, and securing a betterfit and a more effective atmospheric plate. The invention consists in animpression-cup that is provided with a flexible lining on the inside,and with cut-outs or apertures that expose the ascending sides of thealveolar arch and allow of direct lateral manipulation.

A represents the impression tray or cup, which is made of hard rubber orother suitable material, and in the general form of ordinaryimpression-trays. In the body of the tray A, over the soft parts of thearch of the month, are formed openings B, through which directmanipulative pressure may be applied. In case some teeth remain in thejaw, openings may be formed in the plate A directly opposite said teeth,so that they may press directly upon the cover 0 and project throughsaid openings. 0 is a fioor or cover placed in the tray A above andcovering its perforated bottom or floor, and secured at its edges to theedges of the tray A. The floor or cover 0 may be made of muslin, canvas,soft leather, or other suitable material that will allow manipulativepressure to be applied through the openings B. Upon the under sides ofthe cap A are formed support-s D designed for use in GEORGE SHINDLERFOUKE.

Witnesses:

A. H. HUBER, HIRAM L. FRITcH.

